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* elf/dl-sym.c (_dl_sym): Use exact check for caller PC in range
	of DSO address space.
	(_dl_vsym): Likewise.
This commit is contained in:
Ulrich Drepper 2000-10-23 21:40:57 +00:00
parent 0d0db00c02
commit f92338be6e
2 changed files with 37 additions and 27 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2000-10-23 Ulrich Drepper <drepper@redhat.com>
* elf/dl-sym.c (_dl_sym): Use exact check for caller PC in range
of DSO address space.
(_dl_vsym): Likewise.
* elf/dl-sym.c (_dl_sym): For RTLD_DEFAULT, search in objects
global scope if we can determine it.

60
elf/dl-sym.c
View File

@ -35,20 +35,23 @@ _dl_sym (void *handle, const char *name, void *who)
struct link_map *match;
struct link_map *l;
/* If the address is not recognized the call comes from the main
program (we hope). */
match = _dl_loaded;
/* Find the highest-addressed object that CALLER is not below. */
match = NULL;
for (l = _dl_loaded; l; l = l->l_next)
if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
match = l;
for (l = _dl_loaded; l != NULL; l = l->l_next)
if (l->l_addr != 0 && caller >= l->l_map_start && caller < l->l_map_end)
{
/* There must be exactly one DSO for the range of the virtual
memory. Otherwise something is really broken. */
match = l;
break;
}
if (handle == RTLD_DEFAULT)
{
/* Search the global scope as seen in the caller object. */
if (match != NULL)
result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0);
else
result = _dl_lookup_symbol (name, match, &ref, _dl_global_scope, 0, 0);
}
/* Search the global scope as seen in the caller object. */
result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0);
else
{
if (handle != RTLD_NEXT)
@ -56,22 +59,17 @@ _dl_sym (void *handle, const char *name, void *who)
/* Search the scope of the given object. */
struct link_map *map = handle;
if (match == NULL)
/* If the address is not recognized the call comes from the
main program (we hope). */
match = _dl_loaded;
result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope,
0, 1);
}
else
{
if (! match)
if (__builtin_expect (match == _dl_loaded, 0))
_dl_signal_error (0, NULL, N_("\
RTLD_NEXT used in code not dynamically loaded"));
l = match;
while (l->l_loader)
while (l->l_loader != NULL)
l = l->l_loader;
result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
@ -79,7 +77,7 @@ RTLD_NEXT used in code not dynamically loaded"));
}
}
if (ref)
if (ref != NULL)
return DL_SYMBOL_ADDRESS (result, ref);
return NULL;
@ -103,24 +101,32 @@ _dl_vsym (void *handle, const char *name, const char *version, void *who)
/* We don't have a specific file where the symbol can be found. */
vers.filename = NULL;
/* If the address is not recognized the call comes from the main
program (we hope). */
match = _dl_loaded;
/* Find the highest-addressed object that CALLER is not below. */
match = NULL;
for (l = _dl_loaded; l; l = l->l_next)
if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
match = l;
for (l = _dl_loaded; l != NULL; l = l->l_next)
if (l->l_addr != 0 && caller >= l->l_map_start && caller < l->l_map_end)
{
/* There must be exactly one DSO for the range of the virtual
memory. Otherwise something is really broken. */
match = l;
break;
}
if (handle == RTLD_DEFAULT)
/* Search the global scope. */
result = _dl_lookup_versioned_symbol (name, match, &ref, _dl_global_scope,
result = _dl_lookup_versioned_symbol (name, match, &ref, match->l_scope,
&vers, 0, 0);
else if (handle == RTLD_NEXT)
{
if (! match)
if (match == _dl_loaded)
_dl_signal_error (0, NULL, N_("\
RTLD_NEXT used in code not dynamically loaded"));
l = match;
while (l->l_loader)
while (l->l_loader != NULL)
l = l->l_loader;
result = _dl_lookup_versioned_symbol_skip (name, l, &ref,
@ -135,7 +141,7 @@ RTLD_NEXT used in code not dynamically loaded"));
map->l_local_scope, &vers, 0, 1);
}
if (ref)
if (ref != NULL)
return DL_SYMBOL_ADDRESS (result, ref);
return NULL;